"flying is easy: aim for the ground and miss!"
- Reaction score
- South Cambs
Float heights? floats set a little bit too low can do what you describe. Ignition timing. I once had a bike which I subsequently found had faulty electronic ignition it would start normally fly along and then get slower and slower. The faulty automatic advnce curve which was programmed at the factory was gradually retarding the ignition as the electronic ignition module heated up. It took me ages to trace this issue and the bike was off the road for a very long time until I reverted to points and mechanical advance and discovered all my long lost power.The ignition issue is not normal ... I would look at float heights first. Also do you have one fuel tap or two? even though the carbs are normally linked, people with 2 fual taps can find a quick fix by running the bike with both fuel taps opened up. (my XS650 B has linked fuel supplies and also two fuel taps..it should run with one tap open only)I've been working through jetting for pods and pipes, and throughout the process, as well as before, it seems if I run at 70 mph for any length of time, it starves for fuel after a couple minutes. If I slow down or stop, it may die, it starts right back up but from then until I park it, it runs rough, like its running out of gas. I have aftermarket petcocks, they had plastic screens on both the ON standpipes and the RESERVE standpipes. The bike sat from 1997 til a couple months ago with fuel in it, the tank was pretty grungy but I've cleaned it a couple times, the second time because I thought newly loosened up crap had plug up my screens. I replaced the plastic screens with stainless screens that were about 7/16 diameter tubes, I pinched one end, flattened them enough to get them in through the hole in the tank, and pinched them onto the stand pipes (I didn't pinch the standpipes). As usual, my first test ride after that seemed like it was ok, but maybe I didn't go 70 for long enough? Seems like if I run 60, I'm ok, 70 it eventually starves for fuel (I think). It still could be more crap coming from places in the tank I can't see with the bore scope and the chain couldn't get to. I've had the carb bowls off several times changing pilot jets, they look nice and clean. Could the petcocks not deliver enough fuel (seems unlikely there are two of them)? Should I put in an inline filter (I don't see crap in the carb bowl, but I'm kind of curious as to what I may catch)?